Help, how to Make textbox accept numbers only windows form c++

Question

how to Make textbox accept numbers only windows form c++

Answer 1

There are several methods (KeyPress handling, SHLimitInput, ...), but you should use a NumericUpDown

Answer 2

Hi, @Hesham AbdMalek Ramadan
Try to use "[^0-9.]" // added one point

if (System::Text::RegularExpressions::Regex::IsMatch(textBox1->Text, "[^0-9.]"))
{
MessageBox::Show("Please enter only numbers.");
textBox1->Clear();
}

Best regards,

Minxin Yu

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Answer 3

Hi, @Hesham AbdMalek Ramadan

You could try to use the snippet below in textbox keypress event. It can only accept the input of numbers 0-9, backspace and decimal point.

8 stands for backspace,
48 stands for number 0,
57 stands for number 9,
46 stands for decimal point.

private: System::Void textBox1_KeyPress(System::Object^ sender, System::Windows::Forms::KeyPressEventArgs^ e)  
{  
	if (!(e->KeyChar == 8 || (e->KeyChar >= 48 && e->KeyChar <= 57) || e->KeyChar == 46))  
	{  
		e->Handled = true;  
	}  
}  

Best regards,

Minxin Yu

---

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